$\:\lim\:_{x\to\:0}\left(\frac{\sqrt{1+x^2}-\sqrt[4]{1+x^2}}{x^2}\right)$
$7n+14$
$2-sec^2z=1-tan^2z$
$\left(x-3\right)\frac{dy}{dx}+3y=x\left(x-3\right)$
$\frac{8u^4v^2}{5u^3.6u^4v^3}$
$\left(2x+3\right)\cdot\left(4x^2-9x+16\right)+2$
$\frac{7x+2x^2-6}{2x-3x^2}$
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